At least in the US, the reason many gays (men, not women mind you) got HIV was because when people really started hearing about its existence in the 70s and 80s, the God-botherers on the religious right had made getting condoms a friggin' miracle. Thus they instigated a self-fulfilling prophecy where gays got HIV because of the protected sex the religious right made them unable to have.
"The reason things will never get better is because people keep electing these rich cocksuckers who don't give a shit about you."
-George Carlin
-George Carlin